Added support for internationalization

Add `locales: 'en,da'` to the grunt reduce configuration. This will
make asset graph build an english and danish version. Read the section
about internationalization in the asset graph builder documentation
for more info.
Change locales configuration o be an array of strings rather than a comma separated string
Merge branch 'pr/13'

* pr/13:
  Change locales configuration o be an array of strings rather than a comma separated string
  Added support for internationalization